Find roots of polynomial $$ p(x) = d^3+4d^2+5 $$
Answer
The roots of polynomial $ p(d) $ are:
$$ \begin{aligned}d_1 &= -4.2738\\[1 em]d_2 &= 0.1369+1.0729i\\[1 em]d_3 &= 0.1369-1.0729i \end{aligned} $$Explanation
Polynomial $ d^3+4d^2+5 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.
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